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-rw-r--r--src/vehicle_type.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/vehicle_type.h b/src/vehicle_type.h
index d1152ace3..1bba8defa 100644
--- a/src/vehicle_type.h
+++ b/src/vehicle_type.h
@@ -24,6 +24,10 @@ template <> struct EnumPropsT<VehicleType> : MakeEnumPropsT<VehicleType, byte, V
typedef TinyEnumT<VehicleType> VehicleTypeByte;
struct Vehicle;
+struct Train;
+struct RoadVehicle;
+struct Ship;
+struct Aircraft;
struct BaseVehicle
{